11212221221212 has 24 divisors (see below), whose sum is σ = 21444281550720. Its totient is φ = 5087147061360.

The previous prime is 11212221221189. The next prime is 11212221221221. The reversal of 11212221221212 is 21212212221211.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232903912 + ... + 232952047.

It is an arithmetic number, because the mean of its divisors is an integer number (893511731280).

Almost surely, 2^{11212221221212} is an apocalyptic number.

It is an amenable number.

11212221221212 is a deficient number, since it is larger than the sum of its proper divisors (10232060329508).

11212221221212 is a wasteful number, since it uses less digits than its factorization.

11212221221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465856521 (or 465856519 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Adding to 11212221221212 its reverse (21212212221211), we get a palindrome (32424433442423).

Subtracting 11212221221212 from its reverse (21212212221211), we obtain a palindrome (9999990999999).

The spelling of 11212221221212 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".